I had 3 together in a 33 gallon for 3 years, then transferred them to my larger setup where they lived together for another 2 years. They would squabble, but there was never any pieces of tail missing ever.
If you're looking for other beautiful colors in a fish, there are a tonne of wrasses that are reef safe, unlike dwarf angels. Just make sure you have a top though in case they jump.
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